Lock stitch sewing machine



July 23, 1935. (5- SAUER LOCK STITCH SEWING MACHINE- 3 Sheets-Sheet 1 Filed March 19, 1934 We w @J l @w haw @mu uw NN July 23, 1935. G. sAUER LOCK STITCH SEWING MACHINE 3 Sheets-Sheet 2 Filed March 19, 1934 3 Sheets-Sheet 3 Filed March 19, 1934 Patented July 23, 1935 UNITED STATES PATENT OFFICE LOCK STITCH -SEWING MACHINE George' Sauer, Berwyn, Ill., assignor to Union Special Machine Company, Chicago, Ill., a corporation of Illinois Application March 19, 1934, Serial No. 716,415

6 Claims. (Cl. 11B-220) The invention relates to new and useful imshaft. Thus it is that the driving gears for interprovements in a sewing machine and more parconnecting the three shafts, are all located in the ticularly to a lock stitch sewing machine, wherein hollow standard. The gear for driving the feed the stitches are formed through the cooperative shaft is disposed relative to the bottom portion action of a needle and a rotary hook. of the standard so that it runs in an oil bath in 5 An object of the invention is to provide a masaid standard and thus it is that the gears are all chine of the above type, wherein the actuated lubricated through this gear on the feed shaft. parts of the stitch forming mechanism and the Referring morein detail to the drawings, the actuated parts of the feedingV mechanism are all invention is shown as applied to a sewing machine operated from shafts which terminate at the which includesa hollow standard I,having spaced 10 standard and wherein said shafts are interconwalls 2 and 3 at the lower end thereof which are nected at said standard. joined by the usual side walls and all of these A further object of the invention is to provide walls are connected by a plate 4, which completely a machine of the above type, wherein the interhouses the lower end of the standard and forms of intermeshing gears, one of which may be positained. Preferably formed integral with the holtioned so as to run in an oil bath at the lower low standard and projecting laterally therefrom, end ofa hollow enclosed standard. is a work supporting member 5. Also connected In the drawingsto said hollow standard and projecting laterally Figure 1 is a vertical sectional view longituditherefrom is a hollow arm 6 which overhangs the 20 nally through a machine embodying the improve- Work support 5. At the outer end of this arm Ii` ments; is a needle head 1 in which a needle bar 8 recipro- Fig. 2 is an end View of the machine as viewed Cates. Said needle bar carries a needle 9. A main from the right, with parts broken away to show actuating shaft I0 is mounted in a bearing II in connecting parts for the shafts are in the form an oil sump in which an oil bath may be main- 15 the gearing at the standard, and the overhanging arm and a bearing I2 in the 25 Fig. 3 is a view partly in plan and partly in secstandard. This main actuating shaft I0 carries tion looking down on the machine from above a Crank disk I3 at the needle head which is conthe work support and with parts of the work supnected by means 0f a link I4 t0 the needle bal fol' port broken away to show the structure beneath reciprocating the same.

the same. Cooperating with the needle beneath the work 30 The invention is shown as applied to a sewing Support iS a rotary hOOk |5 Said rOtaIY hOOk l5 machine which includes a hollow standard closed is fixed to the end of an actuating shaft I6. This at its lower end, to which is connected a work actuating shaft I6 is mounted for rotation in a support disposed above the lower end of the bearing sleeve I'I carried by a bearing lug I8,

standard. Beneath the work support is the feedwhich is formed integral with the Work SUDDOID 5- 35 ing mechanism which includes afeed bar deriving The shaft at its inner end extends through the its feeding movements from a rotating shaft lowall 2 of the standard into the hollow standard. cated beneath the work support and extending There is a bushing I9 which together with the into the standard. Also located beneath the work shaft closes the Opening thrOllgh Which the Shaft support is a rotating hook which is operated passes. The material is fed across the work sup- 40 from an actuating shaft extending into the standport by a feed dog 20 carried by a feed bal' 2| ard. Connected to the upper end of the standard which is attached to a feed rocker 22. The feed is an overhanging arm carrying a needle head in bar is moved back and forth and is raised and which a needle bar reciprocates. 'I'he needle bar lowered by an actuating shaft 23 located beneath is actuated from a shaft located in said arm and the work support; said shaft carries an eccentric l extending into said hollow standard. with which an eccentric strap 24 cooperates and In the present illustration of the invention, the Said eccentric strap is provided with a member shaft in the overhanging arm is the main actuat- 25 which telescopes within an arm 26 pivoted to ing shaft and it carries a gear which meshes with the feed rocker. Pivoted to this arm is a link 21 a transmitting gear located in the hollow standwhich in turn is pivoted to a member 28 fixed to a `50 ard and journaled on a shaft fixed to the standshaft 29. As the shaft rotates the eccentric strap ard. This transmitting gear meshes with a gear will impart lateral movement to the arm 26 and as on the end of the feed actuating shaft and there the arm 26 swings on its pivotal connection to is a gear on the end of the rotary hook actuating the feed rocker, it will be caused by the link 21 shaftwhich meshes with the gear on the feed to move endwise and thus impart afeeding move- 5" ment to the feed dog. The feed bar is raised and lowered by an eccentric strap 30 which is connected to the feed bar in the usual manner. The specific form of feeding mechanism just referred to, forms no part of the present invention, but is shown, described and claimed in the application filed by George Sauer and Clarence C. Smith, on May 31, 1933, Serial No. 673,738.

The actuating shaft 23 for the feed bar extends through the wall 2 of the housing and rotates in a bushing 3| which together with the shaft closes the opening through which the shaft extends. On the inner end of this shaft 23 is a gear 32. The gear 32 meshes with a transmitting gear 33 carried by a hub 34 journaled on a xed shaft 35 mounted in the hollow standard. The gear is prevented from lateral movement on the shaft by collars 36, 36 fixed to the shaft. This gear 33 meshes with a gear 31 which is fixed to the shaft i0. On the outer end of the shaft i is a belt wheel 38.

On the end of the shaft I6 and located in the hollow standard is a gear 39 which meshes with the gear 32 on the feed shaft.

From the above it will be apparent that the two actuating shafts for the stitch forming mechanism, that is, the shaft which actuates the needle and the shaft which actuates the rotary hook, both extend into the hollow standard. Like- Wise the shaft which actuates the feeding mechanism and imparts all movements thereto, extends into the hollow standard and these three shafts within the hollow standard are interconnected by intermeshing gears so that they are all positively rotated in a certain timed relation to each other. The gear on the main actuating shaft and the gear on the feed shaft both mesh with the transmitting gear and are so dimensioned that the main actuating shaft and thefeed shaft will turn in unison and in the same timing. The gear on the rotary hook shaft is dimensioned so that this shaft is given two rotations for each rotation of the feed shaft. By this arrangement of the rotary hook shaft, so that the gear which actuates the shaft meshes directly with the actuated gear of the feed shaft, all strain is takenoif the feed shaft and the gear connection for driving the rotary hook has a direct connection to the shaft which drives the needle bar so that these two shafts will be maintained in their set timed relation to each other. Furthermore, where the gears which drive the actuating parts are all located in the hollow standard, they may be readily 1ubricated by running the lowermost gear in an oil bath.

The transmitting gear 33 is given a number of teeth which is not a multiple of the gears with which it meshes. A progressive shifting engagement is, therefore, obtained so that a tooth of either the gear 31 or 32 which is subject to special strain, will find itself in contact successively with a different tooth in the transmitting gear. 'Ihis lessens the wear, but a still'more effective distribution of wear is obtained by making the material of the teeth of the transmitting gear softer than the material 4of the teeth of the other gears, as for example, bakelite, thus producing the greatest wear on the teeth which have only intermittent contact with the tooth subject to special strain. This arrangement of the teeth in the driving train of gears, and the general type of machine to which this invention is applied, is shown and described more fully in the application of Norman V. Christensen and Charles F. Rubel, filed May 9, 1933, Serial No. 670,186. While the invention is described as embodied in a sewing machine having a hollow enclosed standard, with an oil sump for lubricating the intermeshing gears, it will be understood that from certain aspects of the invention, the driving mechanism for the needle, the feed and the looper, which is shown and described, may be used in other types of machines. It is also obvious that minor changes in the details of construction may be made without departing from the spirit of the invention as set forth in the appended claims.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent, is-

1. A sewing machine including in combination, a standard, a work support, an arm overhanging the work support, a needle bar carried by said arm, a feeding mechanism and a rotary hook beneath the work support, a transmitting gear carried by the standard, an actuating shaft for the needle bar geared to the transmitting gear, another actuating shaft for the feeding mechanism geared to the transmitting gear, and another actuating shaft for the rotary hook directly geared to the actuating gear for the feed operating shaft.

2. A sewing machine including in combination, a standard, a work support, an arm overhanging the work support, a needle bar carried by said arm, a feeding mechanism and a rotary hook beneath the work support, a transmitting gear carried by the standard, an actuating shaft for the needle bar disposed in said overhanging arm and extending across said standard and having a' gear meshing with the transmitting gear in the standard, an actuating shaft for the feeding mechanism extending into said standard and carrying a gear meshing with the transmitting gear in said standard, an actuating shaft for the rotary hook extending into said standard and carrying a gear directly meshing with the actuating gear for the feed shaft, all of said gears within said standard being disposed for rotation in substantially the same plane.

3. A sewing machine including in combination, a hollow standard closed at its lower end, a work support connected thereto and disposed above the lower end of the standard, an arm carried by the standard and overhanging said work support, a needle bar mounted for reciprocation on said arm, an actuating shaft for the needle bar mounted in said arm and extending into said standard, a feeding mechanism beneath the work support, an actuating shaft therefor disposed beneath the work support and extending into said hollow standard, a rotary hook beneath the work support, an actuating shaft therefor extending into said hollow standard, and means located within the hollow standard and interconnecting said shafts.

4. A sewing machine including in combination a hollow standard closed at its lower end, a work support connected thereto and disposed above the lower end of the standard, an yarm carried by the standard and overhanging saidl work support, a needle bar mounted for reciprocation on said arm, an actuating shaft for the needle bar mounted in said arm and extending into said standard, a. feeding mechanism beneath the work support, an actuating shaft therefor disposed beneath the work support and extending into said hollow standard, a rotary hook beneath the work support, an actuating shaft therefor extending into said hollow standard, a gear connected to the needle actuating shaft and disposed in said standard, a gear connected to the actuating shaft for the feeding mechanism and disposed in said standard, a transmitting gear intermeshing with said gears for imparting rotation of one, shaft to the other, a gear on said hook actuating shaft the feed shaft.

5. A sewing machine including in combination a hollow standard closed at its lower end, a work support connected thereto and disposed above the lower end of the standard, an arm carried by the standard and overhanging said work support, a needle bar mounted for reciprocation on said arm, an actuating shaft for the needle bar mounted in said arm and extending into said standard, a feeding mechanism beneath the work support, an actuating shaft therefor disposed beneath the work support and extending into said hollow standard, a rotary hook beneath the work support, an actuating shaft therefor extending into said hollow standard, a gear connected to the needle actuating shaft and disposed in said standard, a gear connected to the actuating shaft the other, a gear on said hook actuating shaft 1ocated in said standard and meshing with the gear on said feed actuating shaft, said last-named gear being dimensioned so that said hook actuating shaftl is rotatedv twice for each rotation of the feed shaft, al1 of said gears being disposed for rotation in the same plane and said gear for actuating said feed shaft being disposed so as to rotate beneath the surface of an oil bath in said hollow standard.

6. A sewing machine including in combination a standard, a work support, an arm overhanging the work support, a needle bar carried thereby, a feeding mechanism and a rotary' hook beneath the work support, a transmitting gear carried by the standard, an actuating shaft for the needle bar, a gear carried therebyv and meshing with said transmitting gear, an actuating shaft beneath the Work support for the feeding mechanism, a gear carried thereby and meshing with the transmitting gear, an actuating shaft for the rotary hook, and a gear carried thereby meshing with the actuating gear for the feed operating shaft, all of said gears being disposed in a single plane.

GEORGE SAUER. 

